I've heard some horror stories lately regarding people who work in new car sales/repair. Most new car dealers have a very high turn over rate of salesmen and techs. They hire too many of them to begin with that way they're fighting each other for sales and or hours. The dealerships figure if they hire a new salesman then chances are they'll sell a car or two to a friend/family that they otherwise wouldn't make a sale to and after that if the salesman quits it's no big deal they just hire another. Same with the techs. They basically pit them against each other for work. Basically if your car/truck is out of warranty your better off taking it to a reputable independent shop. That's where most of the best mechanics are at these days. With this in mind it's no wonder salesmen know so little about their products. I'm sure most of their customers aren't that picky, they want a red car with Bluetooth and a sunroof and as long as they can cover that 95% they're golden. Probably not even concerned about the handful of stragglers that wander in with technical questions. In my city we have a handful of fleet truck dealers and they are generally much more knowledgeable about their products.